Jstring, String, char* transform function

2. #include <malloc.h>
4. #include <string.h>
6. #include <stdlib.h>
8. #include <vcclr.h>
12. Using namespace System;
14. Using namespace System::Text;
18. Jstring to String
20. string^ Jstringtostr (jnienv* env, jstring jstr)
22. {
24. char* str = jstringtostring (env, JSTR);
26. string^ value = gcnew String (str);
28. Free (str);
30. return value;
32. }
36. Jstring to char*
38. char* jstringtostring (jnienv* env, jstring jstr)
40. {
42. char* RTN = NULL;
44. Jclass clsstring = Env->findclass ("java/lang/string");
46. Jstring Strencode = Env->newstringutf ("Utf-8");
48. Jmethodid mid = Env->getmethodid (clsstring, "GetBytes", "(ljava/lang/string;) [B");
50. Jbytearray Barr = (jbytearray) Env->callobjectmethod (Jstr, Mid, Strencode);
52. Jsize alen = Env->getarraylength (Barr);
54. jbyte* ba = env->getbytearrayelements (Barr, Jni_false);
56. if (Alen > 0)
58. {
60. RTN = (char*) malloc (alen + 1);
62. memcpy (RTN, BA, Alen);
64. Rtn[alen] = 0;
66. }
68. Env->releasebytearrayelements (Barr, BA, 0);
70. return RTN;
72. }
76. String to Jstring
78. Jstring strtojstring (jnienv* env, string^ RTN)
80. {
82. pin_ptr<const wchar_t> wch = PtrToStringChars (RTN);
84. size_t convertedchars = 0;
86. size_t sizeinbytes = ((rtn->length + 1) * 2);
88. char *ch = (char *) malloc (sizeinbytes);
90. errno_t err = wcstombs_s (&convertedchars,
92. CH, sizeinbytes,
94. WCH, sizeInBytes);
96. Jstring js = stringtojstring (env, CH);
98. Free (CH);
100. return JS;
102. }
106. char* to Jstring
108. Jstring stringtojstring (jnienv* env, const char* Pat)
110. {
112. Jclass strclass = Env->findclass ("ljava/lang/string;");
114. Jmethodid Ctorid = Env->getmethodid (strclass, "<init>", "([bljava/lang/string;) V");
116. Jbytearray bytes = Env->newbytearray (strlen (PAT));
118. Env->setbytearrayregion (bytes, 0, strlen (PAT), (jbyte*) PAT);
120. jstring encoding = Env->newstringutf ("Utf-8");
122. return (jstring) env->newobject (strclass, Ctorid, Bytes, encoding);
124. }